Abstract

The analysis of photochemical activities of Photosystem I and Photosystem II in spheroplasts from normal and photobleached Anabaena cylindrica showed an increase in Photosystem II activity relative to Photosystem I in photobleached cells. We suggest that the reasons for this modification in photochemical activity are, (i) a rearrangement of pigments between the two photosystems, and (ii) improved functional condition of the photosynthetic units in Photosystem II.

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